Candidatus Scalindua, a Biological Solution to Treat Saline Recirculating Aquaculture System Wastewater

Recirculating aquaculture systems (RAS) are promising candidates for the sustainable development of industry. A current limitation RAS is production and potential accumulation nitrogenous wastes, ammonium (NH4+), nitrite (NO2?) nitrate (NO3?), which could affect fish health welfare. In a previous experiment, we have demonstrated that marine anammox bacteria Candidatus Scalindua was candidate to treat wastewater (WW) marine, cold-water RAS. However, activity negatively impacted after direct exposure WW. study, further investigated Ca. WW in three-phase experiment. first phase (control, 83 days), fed synthetic feed, enriched NH4+, NO2? trace element (TE) mix. Removal rates 98.9% 99.6% NH4+ NO2?, respectively, were achieved. second (116 gradually increased nitrogen-enriched over period about 80 days. last (79 needs TE supplementation they fully acclimated 100% Our results show gradual resulted successful acclimation WW, with maintained high removal both throughout Despite slight decrease relative abundance (from 21.4% 16.7%), remained dominant species granules whole We conclude can be successfully used without addition TE, once given enough time acclimate its new substrate. Future studies need determine specific optimal treatment by at pilot scale.